Figure 1From: Seasonality and outbreak of a predominant Streptococcus pneumoniaeserotype 1 clone from The Gambia: Expansion of ST217 hypervirulent clonal complex in West AfricaNumbers of laboratory-confirmed serotype 1 pneumococcal isolates obtained from patients with invasive disease by (a) year and (b) month in the study areas of The Gambia from 1996–2006. Bars indicate the total number of serotype 1 pneumococcal isolates; squares those belonging to ST 618 and diamonds those belonging to non-ST618 clones.Back to article page